I have been playing classical guitar for decades as a mostly self-taught amateur, having taken formal training for a couple of years at age 19 and a stray lesson here or there over the years. My taste is music is pretty ecclectic, and my view on what constitutes "good" music is basically in line with what Ellington said -- if it sounds good, it is good. In recent years, I've added flamenco to my repertoire, although I have been unable to find any teachers local to me.
Aside from playing in a garage band in my teens and early twenties, and occasionally jamming with friends over the years, I predominantly play solo. I am fairly proficient at sight reading, and have not put a premium on memorization. This is something I'm working to address as it is a decided shortcoming.
With some exceptions, I'm less interested in learning some of the "old warhorses" of the classical repertoire than I am in learning pieces I find compelling and sonically pleasing. In my view, it is important to explore different genres, especially pieces by contemporary and South American composers.